/*

  author:sakura

*/

var S = {
  init: function () {
    var action = window.location.href,
      i = action.indexOf('?a=')

    S.Drawing.init('.canvas')
    document.body.classList.add('body--ready')

    if (i !== -1) {
      S.UI.simulate(decodeURI(action).substring(i + 3))
    } else {
      S.UI.simulate('|#countdown 3||陈|嘉|群|还|有|两|个|小|时|就|下|班|')
    }

    S.Drawing.loop(function () {
      S.Shape.render()
    })
  }
}

S.Drawing = (function () {
  var canvas, context, renderFn
  requestFrame =
    window.requestAnimationFrame ||
    window.webkitRequestAnimationFrame ||
    window.mozRequestAnimationFrame ||
    window.oRequestAnimationFrame ||
    window.msRequestAnimationFrame ||
    function (callback) {
      window.setTimeout(callback, 1000 / 60)
    }

  return {
    init: function (el) {
      canvas = document.querySelector(el)
      context = canvas.getContext('2d')
      this.adjustCanvas()

      window.addEventListener('resize', function (e) {
        S.Drawing.adjustCanvas()
      })
    },

    loop: function (fn) {
      renderFn = !renderFn ? fn : renderFn
      this.clearFrame()
      renderFn()
      requestFrame.call(window, this.loop.bind(this))
    },

    adjustCanvas: function () {
      canvas.width = window.innerWidth
      canvas.height = window.innerHeight
    },

    clearFrame: function () {
      context.clearRect(0, 0, canvas.width, canvas.height)
    },

    getArea: function () {
      return { w: canvas.width, h: canvas.height }
    },

    drawCircle: function (p, c) {
      context.fillStyle = c.render()
      context.beginPath()
      context.arc(p.x, p.y, p.z, 0, 2 * Math.PI, true)
      context.closePath()
      context.fill()
    }
  }
})()

S.UI = (function () {
  var canvas = document.querySelector('.canvas'),
    interval,
    isTouch = false, //('ontouchstart' in window || navigator.msMaxTouchPoints),
    currentAction,
    resizeTimer,
    time,
    maxShapeSize = 30,
    firstAction = true,
    sequence = [],
    cmd = '#'

  function formatTime(date) {
    var h = date.getHours(),
      m = date.getMinutes(),
      m = m < 10 ? '0' + m : m
    return h + ':' + m
  }

  function getValue(value) {
    return value && value.split(' ')[1]
  }

  function getAction(value) {
    value = value && value.split(' ')[0]
    return value && value[0] === cmd && value.substring(1)
  }

  function timedAction(fn, delay, max, reverse) {
    clearInterval(interval)
    currentAction = reverse ? max : 1
    fn(currentAction)

    if (
      !max ||
      (!reverse && currentAction < max) ||
      (reverse && currentAction > 0)
    ) {
      interval = setInterval(function () {
        currentAction = reverse ? currentAction - 1 : currentAction + 1
        fn(currentAction)

        if (
          (!reverse && max && currentAction === max) ||
          (reverse && currentAction === 0)
        ) {
          clearInterval(interval)
        }
      }, delay)
    }
  }

  function reset(destroy) {
    clearInterval(interval)
    sequence = []
    time = null
    destroy && S.Shape.switchShape(S.ShapeBuilder.letter(''))
  }

  function performAction(value) {
    var action, value, current

    // overlay.classList.remove('overlay--visible');
    sequence =
      typeof value === 'object' ? value : sequence.concat(value.split('|'))
    // input.value = '';
    // checkInputWidth();

    timedAction(
      function (index) {
        current = sequence.shift()
        action = getAction(current)
        value = getValue(current)

        switch (action) {
          case 'countdown':
            value = parseInt(value) || 10
            value = value > 0 ? value : 10

            timedAction(
              function (index) {
                if (index === 0) {
                  if (sequence.length === 0) {
                    S.Shape.switchShape(S.ShapeBuilder.letter(''))
                  } else {
                    performAction(sequence)
                  }
                } else {
                  S.Shape.switchShape(S.ShapeBuilder.letter(index), true)
                }
              },
              1000,
              value,
              true
            )
            break

          case 'rectangle':
            value = value && value.split('x')
            value =
              value && value.length === 2
                ? value
                : [maxShapeSize, maxShapeSize / 2]

            S.Shape.switchShape(
              S.ShapeBuilder.rectangle(
                Math.min(maxShapeSize, parseInt(value[0])),
                Math.min(maxShapeSize, parseInt(value[1]))
              )
            )
            break

          case 'circle':
            value = parseInt(value) || maxShapeSize
            value = Math.min(value, maxShapeSize)
            S.Shape.switchShape(S.ShapeBuilder.circle(value))
            break

          case 'time':
            var t = formatTime(new Date())

            if (sequence.length > 0) {
              S.Shape.switchShape(S.ShapeBuilder.letter(t))
            } else {
              timedAction(function () {
                t = formatTime(new Date())
                if (t !== time) {
                  time = t
                  S.Shape.switchShape(S.ShapeBuilder.letter(time))
                }
              }, 1000)
            }
            break

          default:
            S.Shape.switchShape(
              S.ShapeBuilder.letter(current[0] === cmd ? 'What?' : current)
            )
        }
      },
      2000,
      sequence.length
    )
  }

  function checkInputWidth(e) {
    if (input.value.length > 18) {
      ui.classList.add('ui--wide')
    } else {
      ui.classList.remove('ui--wide')
    }

    if (firstAction && input.value.length > 0) {
      ui.classList.add('ui--enter')
    } else {
      ui.classList.remove('ui--enter')
    }
  }

  function bindEvents() {
    document.body.addEventListener('keydown', function (e) {
      input.focus()

      if (e.keyCode === 13) {
        firstAction = false
        reset()
        performAction(input.value)
      }
    })

    // input.addEventListener('input', checkInputWidth);
    // input.addEventListener('change', checkInputWidth);
    // input.addEventListener('focus', checkInputWidth);

    // help.addEventListener('click', function (e) {
    //   overlay.classList.toggle('overlay--visible');
    //   overlay.classList.contains('overlay--visible') && reset(true);
    // });

    // commands.addEventListener('click', function (e) {
    //   var el,
    //       info,
    //       demo,
    //       tab,
    //       active,
    //       url;
    //
    //   if (e.target.classList.contains('commands-item')) {
    //     el = e.target;
    //   } else {
    //     el = e.target.parentNode.classList.contains('commands-item') ? e.target.parentNode : e.target.parentNode.parentNode;
    //   }
    //
    //   info = el && el.querySelector('.commands-item-info');
    //   demo = el && info.getAttribute('data-demo');
    //   url = el && info.getAttribute('data-url');
    //
    //   if (info) {
    //     overlay.classList.remove('overlay--visible');
    //
    //     if (demo) {
    //       input.value = demo;
    //
    //       if (isTouch) {
    //         reset();
    //         performAction(input.value);
    //       } else {
    //         input.focus();
    //       }
    //     } else if (url) {
    //       //window.location = url;
    //     }
    //   }
    // });

    canvas.addEventListener('click', function (e) {
      overlay.classList.remove('overlay--visible')
    })
  }

  function init() {
    bindEvents()
    // input.focus();
    isTouch && document.body.classList.add('touch')
  }

  // Init
  init()

  return {
    simulate: function (action) {
      performAction(action)
    }
  }
})()

S.UI.Tabs = (function () {
  var tabs = document.querySelector('.tabs'),
    labels = document.querySelector('.tabs-labels'),
    triggers = document.querySelectorAll('.tabs-label'),
    panels = document.querySelectorAll('.tabs-panel')

  function activate(i) {
    triggers[i].classList.add('tabs-label--active')
    panels[i].classList.add('tabs-panel--active')
  }

  function bindEvents() {
    labels.addEventListener('click', function (e) {
      var el = e.target,
        index

      if (el.classList.contains('tabs-label')) {
        for (var t = 0; t < triggers.length; t++) {
          triggers[t].classList.remove('tabs-label--active')
          panels[t].classList.remove('tabs-panel--active')

          if (el === triggers[t]) {
            index = t
          }
        }

        activate(index)
      }
    })
  }

  function init() {
    activate(0)
    bindEvents()
  }

  // Init
  init()
})()

S.Point = function (args) {
  this.x = args.x
  this.y = args.y
  this.z = args.z
  this.a = args.a
  this.h = args.h
}

S.Color = function (r, g, b, a) {
  this.r = r
  this.g = g
  this.b = b
  this.a = a
}

S.Color.prototype = {
  render: function () {
    return 'rgba(' + this.r + ',' + +this.g + ',' + this.b + ',' + this.a + ')'
  }
}

S.Dot = function (x, y) {
  this.p = new S.Point({
    x: x,
    y: y,
    z: 5,
    a: 1,
    h: 0
  })

  this.e = 0.07
  this.s = true

  this.c = new S.Color(255, 255, 255, this.p.a)

  this.t = this.clone()
  this.q = []
}

S.Dot.prototype = {
  clone: function () {
    return new S.Point({
      x: this.x,
      y: this.y,
      z: this.z,
      a: this.a,
      h: this.h
    })
  },

  _draw: function () {
    this.c.a = this.p.a
    S.Drawing.drawCircle(this.p, this.c)
  },

  _moveTowards: function (n) {
    var details = this.distanceTo(n, true),
      dx = details[0],
      dy = details[1],
      d = details[2],
      e = this.e * d

    if (this.p.h === -1) {
      this.p.x = n.x
      this.p.y = n.y
      return true
    }

    if (d > 1) {
      this.p.x -= (dx / d) * e
      this.p.y -= (dy / d) * e
    } else {
      if (this.p.h > 0) {
        this.p.h--
      } else {
        return true
      }
    }

    return false
  },

  _update: function () {
    if (this._moveTowards(this.t)) {
      var p = this.q.shift()

      if (p) {
        this.t.x = p.x || this.p.x
        this.t.y = p.y || this.p.y
        this.t.z = p.z || this.p.z
        this.t.a = p.a || this.p.a
        this.p.h = p.h || 0
      } else {
        if (this.s) {
          this.p.x -= Math.sin(Math.random() * 3.142)
          this.p.y -= Math.sin(Math.random() * 3.142)
        } else {
          this.move(
            new S.Point({
              x: this.p.x + Math.random() * 50 - 25,
              y: this.p.y + Math.random() * 50 - 25
            })
          )
        }
      }
    }

    d = this.p.a - this.t.a
    this.p.a = Math.max(0.1, this.p.a - d * 0.05)
    d = this.p.z - this.t.z
    this.p.z = Math.max(1, this.p.z - d * 0.05)
  },

  distanceTo: function (n, details) {
    var dx = this.p.x - n.x,
      dy = this.p.y - n.y,
      d = Math.sqrt(dx * dx + dy * dy)

    return details ? [dx, dy, d] : d
  },

  move: function (p, avoidStatic) {
    if (!avoidStatic || (avoidStatic && this.distanceTo(p) > 1)) {
      this.q.push(p)
    }
  },

  render: function () {
    this._update()
    this._draw()
  }
}

S.ShapeBuilder = (function () {
  var gap = 13,
    shapeCanvas = document.createElement('canvas'),
    shapeContext = shapeCanvas.getContext('2d'),
    fontSize = 400,
    fontFamily = 'Avenir, Helvetica Neue, Helvetica, Arial, sans-serif'

  function fit() {
    shapeCanvas.width = Math.floor(window.innerWidth / gap) * gap
    shapeCanvas.height = Math.floor(window.innerHeight / gap) * gap
    shapeContext.fillStyle = 'red'
    shapeContext.textBaseline = 'middle'
    shapeContext.textAlign = 'center'
  }

  function processCanvas() {
    var pixels = shapeContext.getImageData(
      0,
      0,
      shapeCanvas.width,
      shapeCanvas.height
    ).data
    ;(dots = []),
      pixels,
      (x = 0),
      (y = 0),
      (fx = shapeCanvas.width),
      (fy = shapeCanvas.height),
      (w = 0),
      (h = 0)

    for (var p = 0; p < pixels.length; p += 4 * gap) {
      if (pixels[p + 3] > 0) {
        dots.push(
          new S.Point({
            x: x,
            y: y
          })
        )

        w = x > w ? x : w
        h = y > h ? y : h
        fx = x < fx ? x : fx
        fy = y < fy ? y : fy
      }

      x += gap

      if (x >= shapeCanvas.width) {
        x = 0
        y += gap
        p += gap * 4 * shapeCanvas.width
      }
    }

    return { dots: dots, w: w + fx, h: h + fy }
  }

  function setFontSize(s) {
    shapeContext.font = 'bold ' + s + 'px ' + fontFamily
  }

  function isNumber(n) {
    return !isNaN(parseFloat(n)) && isFinite(n)
  }

  function init() {
    fit()
    window.addEventListener('resize', fit)
  }

  // Init
  init()

  return {
    imageFile: function (url, callback) {
      var image = new Image(),
        a = S.Drawing.getArea()

      image.onload = function () {
        shapeContext.clearRect(0, 0, shapeCanvas.width, shapeCanvas.height)
        shapeContext.drawImage(this, 0, 0, a.h * 0.6, a.h * 0.6)
        callback(processCanvas())
      }

      image.onerror = function () {
        callback(S.ShapeBuilder.letter('What?'))
      }

      image.src = url
    },

    circle: function (d) {
      var r = Math.max(0, d) / 2
      shapeContext.clearRect(0, 0, shapeCanvas.width, shapeCanvas.height)
      shapeContext.beginPath()
      shapeContext.arc(r * gap, r * gap, r * gap, 0, 2 * Math.PI, false)
      shapeContext.fill()
      shapeContext.closePath()

      return processCanvas()
    },

    letter: function (l) {
      var s = 0

      setFontSize(fontSize)
      s = Math.min(
        fontSize,
        (shapeCanvas.width / shapeContext.measureText(l).width) *
          0.8 *
          fontSize,
        (shapeCanvas.height / fontSize) * (isNumber(l) ? 1 : 0.45) * fontSize
      )
      setFontSize(s)

      shapeContext.clearRect(0, 0, shapeCanvas.width, shapeCanvas.height)
      shapeContext.fillText(l, shapeCanvas.width / 2, shapeCanvas.height / 2)

      return processCanvas()
    },

    rectangle: function (w, h) {
      var dots = [],
        width = gap * w,
        height = gap * h

      for (var y = 0; y < height; y += gap) {
        for (var x = 0; x < width; x += gap) {
          dots.push(
            new S.Point({
              x: x,
              y: y
            })
          )
        }
      }

      return { dots: dots, w: width, h: height }
    }
  }
})()

S.Shape = (function () {
  var dots = [],
    width = 0,
    height = 0,
    cx = 0,
    cy = 0

  function compensate() {
    var a = S.Drawing.getArea()

    cx = a.w / 2 - width / 2
    cy = a.h / 2 - height / 2
  }

  return {
    shuffleIdle: function () {
      var a = S.Drawing.getArea()

      for (var d = 0; d < dots.length; d++) {
        if (!dots[d].s) {
          dots[d].move({
            x: Math.random() * a.w,
            y: Math.random() * a.h
          })
        }
      }
    },

    switchShape: function (n, fast) {
      var size,
        a = S.Drawing.getArea()

      width = n.w
      height = n.h

      compensate()

      if (n.dots.length > dots.length) {
        size = n.dots.length - dots.length
        for (var d = 1; d <= size; d++) {
          dots.push(new S.Dot(a.w / 2, a.h / 2))
        }
      }

      var d = 0,
        i = 0

      while (n.dots.length > 0) {
        i = Math.floor(Math.random() * n.dots.length)
        dots[d].e = fast ? 0.25 : dots[d].s ? 0.14 : 0.11

        if (dots[d].s) {
          dots[d].move(
            new S.Point({
              z: Math.random() * 20 + 10,
              a: Math.random(),
              h: 18
            })
          )
        } else {
          dots[d].move(
            new S.Point({
              z: Math.random() * 5 + 5,
              h: fast ? 18 : 30
            })
          )
        }

        dots[d].s = true
        dots[d].move(
          new S.Point({
            x: n.dots[i].x + cx,
            y: n.dots[i].y + cy,
            a: 1,
            z: 5,
            h: 0
          })
        )

        n.dots = n.dots.slice(0, i).concat(n.dots.slice(i + 1))
        d++
      }

      for (var i = d; i < dots.length; i++) {
        if (dots[i].s) {
          dots[i].move(
            new S.Point({
              z: Math.random() * 20 + 10,
              a: Math.random(),
              h: 20
            })
          )

          dots[i].s = false
          dots[i].e = 0.04
          dots[i].move(
            new S.Point({
              x: Math.random() * a.w,
              y: Math.random() * a.h,
              a: 0.3, //.4
              z: Math.random() * 4,
              h: 0
            })
          )
        }
      }
    },

    render: function () {
      for (var d = 0; d < dots.length; d++) {
        dots[d].render()
      }
    }
  }
})()

S.init()
